In need of protection against spikes and transients? Pick this plug-in surge protector from Phoenix Contact. It shields your low-voltage or single-phase PSUs from supply abnormalities or lightning strikes up to 230V AC and 40kA. An impulse withstand voltage rating of 1.35kV AC shows it handles significant electrical anomalies without breaking a sweat. A mechanical indicator on the top of the device lets you gauge its operating status, making it a doddle to detect faults as they happen.
The protector fits into a DIN rail-mounting VAL-MS series base element (445-5252), which is a wiring bridge that links several bits of kit together so you can connect them all to the ground for safety. Thanks to its simple plug-in design, you get easy installation and maintenance to boot. As it only weighs 41.1g, you can be sure it won't strain your rail.

• Shrugs off shock and vibrations, for safe installation near moving machinery
• Works across a broad operating temperature range of -40°C to +80°C to suit industrial environments
• Operates safely up to 2000m above sea level for use in high-altitude locations
• IP20 rating indicates it's finger-safe to protect against electric shocks

Voltage surges, often referred to as spikes or transients are typically caused by switching of fluorescent lights, fuses blowing or nearby lightning activity. The worst voltage spikes are usually caused by lightning strikes and can reach up to 6000V, with current surges of over 3000A. The maximum size of the let-through voltage and current inrush depends on the location within the building's wiring system. BS7671: 2011 Amendment 1 Sections 443 and 534 cover risk assessment and provides guidance on protection of electronic equipment for installation engineers to follow. The fullest information on lightning and surge protection comes from the BSEN 62305 series of standards.